How secure is the security wipe?

Hi,
I have to send my Z10 in for repair so I have wiped my phone but just wondered if it would still be possible for data to be retrieved? It should be being repaired or replaced by BlackBerry as it is still under warranty.

Hi,
I have to send my Z10 in for repair so I have wiped my phone but just wondered if it would still be possible for data to be retrieved? It should be being repaired or replaced by BlackBerry as it is still under warranty.

Posted via CB10

Its not Android or iOS.

It will wipe, overwrite it with useless data (like 0,1) that makes no sense whatsoever, wipe it again.
So no, no way to recover it because the original data has been overwritten

You cannot retrieve data after a security wipe.
Science. In dumbed down terms, normal erase is putting a sign over the start of the data which says blank. Security wipes rewrites a pass of zeros over the data, effectively destroying it.